The Fire Rainbow happens when you have high-altitude sunlight (58 degrees or higher) hitting special types of ice crystals known as hexagonal plate crystals, found naturally in very-high altitude cirrus clouds.

The Honeycomb Inexplicably Offset Icon Grid is still arranged in the same way, but the actual honeycomb graphics-that is, the hexagonal icon containers that filled the original matrix-have been done away with.

Interestingly, with the ix-onic, Hyundai designers are now going on record saying they are working toward defining a "hexagonal" front graphic as the company's new universal corporate face (check out the video).